- vcf-midatlantic - lists.vcfed.org

Building a RAM Board for the Ohio Scientific Bus
by Systems Glitch 23 Apr '16

23 Apr '16

As promised, I've designed, built, and written up a project for putting a modern static RAM on the OSI bus: http://www.glitchwrks.com/2016/04/23/32k-ram-for-osi Complete with schematics, explanations of the various blocks of the circuit, and assembly tips! This was of course built on one of the clone 495 boards I had made. The linked design is a 32K board based around the common 62256 32K x 8 SRAM, which follows JEDEC pinouts. There's a number of compatible ICs, and you can also use ROM if you like. Memory is split up into 4K segments which can be individually enabled or disabled via DIP switch, allowing you to map around existing memory without disabling it. Pretty simple to build even using point-to-point wiring. I'll be working on adding a second SRAM and expanding the board to 64K this weekend. Another writeup will follow with details on that process. The upper 32K will be switchable like the lower 32K, to allow mapping around I/O devices and optionally enabling that 8K between 0xD000 - 0xE000 that CP/M wants on the 510 CPU board. I designed the circuit so that a Ferroelectric RAM (FeRAM) can be swapped in, with the addition of a write protect circuit. I'll cover that in a later writeup. Is this the sort of thing people would like to see turned into a proper board? I did the schematic in KiCad, so I'd be half the way to creating a board from the prototype. I can do a small run of them and provide either assembled/tested boards or kits. Thanks, Jonathan

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amiga 500 replacement drive wanted
by william degnan 23 Apr '16

23 Apr '16

Anyone have a replacement Epson SMD-400? I have a customer who sent me an Amiga with a bad drive. She also bought another drive, that one is bad too. I am also looking possibly for an upgrade ROM for the Amiga, so I can boot off an external drive instead..These are easier to find. b -- @ BillDeg: Web: vintagecomputer.net Twitter: @billdeg <https://twitter.com/billdeg> Youtube: @billdeg <https://www.youtube.com/user/billdeg> Unauthorized Bio <http://www.vintagecomputer.net/readme.cfm>

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FS: More Ohio Scientific 495 Boards
by Systems Glitch 22 Apr '16

22 Apr '16

link: http://www.ebay.com/itm/272173918152 Buy it Now for $100, feel free to make an offer! $100 is slightly less than I have in each board. These are the three remaining spares from my prototype run. I'll use their sales to determine if/when I'm going to do another run -- don't want to get stuck with a ton of protoboards and be out the money. *** If you want one of these, let me know! *** I'd be happy to keep them as a stock item, but I don't think there's going to be huge demand for them. Thanks, Jonathan

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VCF East - Thanks!
by Blatboy 22 Apr '16

22 Apr '16

I've been lurking on the list here for a few months and finally made it out. Just wanted to quickly tell you how much I enjoyed VCF East. It was my first time to come to one, or to any event like this. Up to this point, I've not talked to many folks in person that share my interests in this field, so it was a rare treat. I'm going to try to make some more events in the future if schedule allows. Walter Hawkes http://www.jwalterhawkes.com http://www.blatboy.com like to know where/when I'm playing? Click here <http://www.blatomaster.com/mlist.php> to sign up for my list, and let the babble begin.

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Re: [vcf-midatlantic] VCF East XI....pics
by VAXman＠tmesis.org 22 Apr '16

22 Apr '16

william degnan via vcf-midatlantic writes: >> I saw those yesterday when you posted a link to your pix. I also see that >> I made the background in the IEEE's video report and I almost didn't make >> it there on Sunday. >> >> >I am glad you did, you really helped me with useful updates to my MicroVAX, >DECnet, and understanding how to set the configuration, queues, files, >networking, and so on. I was amazed my MicroVAX SMTP routing was being >hijacked already. I need to sure that up. > >I have already set things back for service, now with my new VT220, to >continue this project. You, as well as the rest of the internet, would be better served if you'd update/upgrade VMS and that Multinet installation on your machine. There are way too many nefarious types looking to exploit any system as soon as it is connected to the internet, as you were witness to on Sunday. There are many more safeguards in the recent versions that would serve you well.

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Re: [vcf-midatlantic] VCF East XI....pics
by VAXman＠tmesis.org 22 Apr '16

22 Apr '16

Dan Roganti via vcf-midatlantic writes: >On Thu, Apr 21, 2016 at 1:25 AM, Dan Roganti <ragooman(a)gmail.com> wrote: > >> I posted a few pics It's still a rough cut, no title, no descriptions >> I was going to add these later, using the info from the exhibitors page >> on VCFed I didn't get pics of the classes since they were in parallel >> tracks oddly enough, a lot of the exhibitor pics don't include the >> exhibitor don't tell Evan you weren't at your booth :) >> http://www.rogtronics.net/blog/?page_id=3D688 >> Dan > > Vaxman, you're in there too in the deepest concentration :) > starting on the 33rd row I saw those yesterday when you posted a link to your pix. I also see that I made the background in the IEEE's video report and I almost didn't make it there on Sunday.

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Some post VCF East press
by Tony Bogan 21 Apr '16

21 Apr '16

http://spectrum.ieee.org/tech-talk/geek-life/history/theyre-alive-vintage-c… Sent from my iPhone

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Re: [vcf-midatlantic] IEEE Spectrum article...
by Douglas Crawford 21 Apr '16

21 Apr '16

Great press. Thanks for pushing that out right away. On Thu, Apr 21, 2016 at 11:19 AM, Bill Sudbrink via vcf-midatlantic < vcf-midatlantic(a)lists.vintagecomputerfederation.org> wrote: > > http://spectrum.ieee.org/tech-talk/geek-life/history/theyre-alive-vintage-co > mputer-fans-keep-the-great-machines-of-the-past-running > > For those who could not attend, you can see the Cyclops > in operation and see that still photos don't do justice > to the image displayed. Cyclops at around 45 seconds in. > > Bill S. > > >

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IEEE Spectrum article...
by Bill Sudbrink 21 Apr '16

21 Apr '16

http://spectrum.ieee.org/tech-talk/geek-life/history/theyre-alive-vintage-co mputer-fans-keep-the-great-machines-of-the-past-running For those who could not attend, you can see the Cyclops in operation and see that still photos don't do justice to the image displayed. Cyclops at around 45 seconds in. Bill S.

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Anyone bringing IBM 3270 related items to VCF?
by Jason Perkins 21 Apr '16

21 Apr '16

Is anyone bringing a machine which uses 3270 protocols over coax? I have an AppleLine 3270 adapter and I'd love to know if it works. Thanks, -- Jason Perkins

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